VFD Energy Savings Calculator

Calculate energy and cost savings from installing a variable frequency drive on fans and pumps using affinity laws.

Motor rated HP.
HP
Average VFD speed as % of full speed.
%
Hours per year at reduced speed.
h/yr
$/kWh.
$/kWh
2 = Square torque (fans/pumps), 1 = Constant torque.

Results

Power at Full Speed-kW
Power at Reduced Speed-kW
Annual Energy Savings-kWh
Annual Cost Savings-$
Power Reduction-%
References: DOE — Energy Savings with VFDs; NEMA Application Guide